CN101068126B - Peak value searching method and device used for code division multiple access - Google Patents
Peak value searching method and device used for code division multiple access Download PDFInfo
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- CN101068126B CN101068126B CN2007101052304A CN200710105230A CN101068126B CN 101068126 B CN101068126 B CN 101068126B CN 2007101052304 A CN2007101052304 A CN 2007101052304A CN 200710105230 A CN200710105230 A CN 200710105230A CN 101068126 B CN101068126 B CN 101068126B
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Abstract
A peak value search device used on CDMA consists of time delay extension-acceleration module, peak value search module and time delay extension-filter module for solving problem of path possible loss in existed technique when signal power is less than noise power. The method applying said device to carry out peak value search of CDMA is also disclosed.
Description
Technical field
The present invention relates to CDMA (code division multiple access) moving communicating field, relate in particular to a kind of peak value searching method and device that is used for code division multiple access.
Background technology
In the technology of existing mobile communication, the signal that sends from the base station propagates into the user along different routes of transmission, because the length difference of these propagation paths, so these signals arrival users' time is also different, has time delay each other.Generally speaking, the spreading rate of cdma system is very high, and scrambler has good autocorrelation in addition, thereby has very strong multi-path resolved rate, can make full use of the intrinsic frequency diversity of multipath channel, improves the error performance of system.
The Multipath searching function of cdma receiver is the signal of receiving by despreading, forms the time delay expansion, and aerial path is determined in expansion according to time delay, and follows the tracks of the variation in aerial path, gives the finger peak of RAKE receiver aerial path allocation.RAKE receiver is carried out despreading according to finger peak information to the data in every aerial path, again all these is referred to that the pairing despread data in peak merges by high specific, can effectively improve receptivity like this.
Existing multipath searching method may further comprise the steps:
(1) slip correlation step: it is relevant that the I, the Q data that receive are slided with scrambler and spreading code, obtains the time delay expansion.
(2) time delay is expanded average step: a plurality of time delays expansion that obtains in each frame is added up and asks average, and to the time delay expansion of multiframe on average ask average again, obtain the higher time delay expansion of signal interference ratio to eliminate white noise.
(3) peak value searching step: to the average search maximum that the time delay that obtains in step (2) is expanded, each maximum all may be an aerial path.
(4) refer to peak protection step: the maximum of the time delay expansion that draws according to step (3), judge whether current finger peak also exists, and whether new finger peak appearance is arranged.
(5) refer to the peak refresh step:, refresh the time delay information that refers to the peak according to the judged result of step (4).
(6) refer to the peak allocation step: the finger peak of selecting the path configurations RAKE receiver that power is higher or signal interference ratio is higher.
The average method of current time delay expansion mainly is to calculate a plurality of time delays expansions in every frame, and asks the average of these time delays expansions, and then average with the time delay expansion of multiframe, further eliminates white noise.
As shown in Figure 1, the existing structure chart that is used for the peak value searching device of code division multiple access.The existing peak value searching device that is used for code division multiple access comprises slip correlation module 11, time delay expansion computing module 12, time delay expansion accumulator module 13, time delay extension storage module 14, time delay expansion interpolation filtering module 15, interframe time delay extension storage module 16 and peak value searching module 17.
Existing peak value searching method and the device that is used for code division multiple access in order to obtain higher signal interference ratio, obtains the aerial path delay of time accurately, and needing increases the frame number that the time delay expansion adds up, but has therefore reduced the peak value refreshing frequency, causes the possibility that refers to that the peak is lost.Refer to the frequency that the peak refreshes if improve, just need to reduce the frame number of time delay expansion accumulation, and so, the signal interference ratio of time delay expansion has just reduced, may occur the power of the power of noise again, even some signal is too low owing to power, and causes the number of peaks of peak value searching searching functions limited greater than signal, and can not find these paths, these paths are lost.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of peak value searching method and device that is used for code division multiple access, and solving in the prior art when signal power during less than noise power, possible lost path can't extract the problem of correct signal.
In order to address the above problem, the invention provides a kind of peak value searching device that is used for code division multiple access, described device comprises time delay expansion accumulator module at least, time delay extension storage module, interframe time delay extension storage module and peak value searching module, it is characterized in that, also comprise time delay extended filtering module; Described time delay extension storage module is used to store the time delay spreading result from every frame of described time delay expansion accumulator module, and this time delay spreading result is sent to described time delay extended filtering module; Described time delay extended filtering module, be used for carrying out filtering from the time delay spreading result of the past N frame of described time delay extension storage module and the time delay spreading result of present frame, and filtered time delay spreading result is sent to described interframe time delay extension storage module, N is a positive integer; Described interframe time delay extension storage module is used to store the time delay spreading result of handling from the process interframe of described time delay extended filtering module, and this time delay spreading result is sent to described peak value searching module.
The peak value searching device that is used for code division multiple access of the present invention, wherein, the described average filter that is filtered into.
The peak value searching device that is used for code division multiple access of the present invention, wherein, the time domain equation of described average filter is:
The peak value searching device that is used for code division multiple access of the present invention, wherein, described device also comprises time delay expansion interpolation filtering module and selector switch, and whether described selector switch is used to control described time delay expansion interpolation filtering module and is connected with described interframe time delay extension storage module with described time delay extended filtering module; Described time delay expansion interpolation filtering module is used for when described selector switch is controlled described time delay and expanded the interpolation filtering module and be connected with described interframe time delay memory module with described time delay extended filtering module, handle carry out interpolation from the time delay spreading result of described time delay extended filtering module, and the time delay spreading result after the interpolation processing is sent to described interframe time delay extension storage module.
The invention provides a kind of peak value searching method that is used for code division multiple access, it is characterized in that, this method may further comprise the steps:
(1) with scrambler and spreading code the data of receiving are slided relevantly, obtain the correlation that the sampled point number is S, S is the integer greater than 1;
(2) according to described correlation, calculate S time delay expansion sampled result of each time slot in P the time slot, P is a positive integer, P time slot formed a frame;
(3) the time delay spreading result of the sampled point of the S in each frame at P time slot added up, store the time delay spreading result of every frame;
(4) the time delay spreading result of past N frame and the time delay spreading result of present frame are carried out filtering, N is a positive integer, the time delay spreading result that storage is handled through interframe;
(5) utilize peak value searching that the time delay spreading result of handling through interframe is carried out the peak value searching ordering, draw peak value.
The peak value searching method that is used for code division multiple access of the present invention, wherein, the described average filter that is filtered into.
The peak value searching method that is used for code division multiple access of the present invention, wherein, the time domain equation of described average filter is:
The peak value searching method that is used for code division multiple access of the present invention, wherein, the step of described method (4) further comprises step:
Before the time delay spreading result that storage is handled through interframe, filtered time delay spreading result is carried out interpolation handle.
Adopt method and apparatus of the present invention, compared with prior art, the peak value searching that accurately and fast is used for code division multiple access can be provided, thereby reduce false-alarm and fail to report, also improved the peak value precision when having improved the frequency that peak value searching reports, the realization of device of the present invention is simple in addition.
Description of drawings
Fig. 1 is the existing structure chart that is used for the peak value searching device of code division multiple access;
Fig. 2 is the structure chart of a kind of concrete enforcement of device of the present invention;
Fig. 3 is the time delay expander graphs of P time slot in a kind of frame of concrete enforcement of device of the present invention;
Fig. 4 is M the peak value direction memory to obtaining of a kind of concrete enforcement of device of the present invention.
Fig. 5 is the another kind of concrete structure chart of implementing of device of the present invention;
Fig. 6 is the structure chart of a kind of concrete enforcement of the method for the invention;
Fig. 7 be a kind of concrete enforcement of the method for the invention adopt N radio frames averaged the time delay expander graphs of filtering.
Embodiment
The present invention is in order to solve the drawback that conventional solution exists, further set forth a kind of peak value searching method and device that is used for code division multiple access of the present invention by following examples, below embodiment is described in detail, but not as a limitation of the invention.
Peak value searching method and the device that is used for code division multiple access of the present invention, on the average basis of time delay expansion, the time delay spreading result is carried out filtering, increase substantially the signal interference ratio of time delay expansion, peak value searching is carried out in filtered time delay expansion, provide more accurately and fast data to carry out Multipath searching, thereby obviously reduce false-alarm and fail to report, even under the situation of signal power less than noise power, also can extract correct signal, and can be to refer to that the peak refreshes the cycle with every frame.
As shown in Figure 2, the structure chart of the described device of the embodiment of the invention.Device provided by the invention comprises slip correlation module 21, time delay expansion computing module 22, time delay expansion accumulator module 23, time delay extension storage module 24, time delay extended filtering module 25, time delay expansion interpolation filtering module 26, selector switch 27, interframe time delay extension storage module 28 and peak value searching module 29
Time delay expansion computing module 22 is used for according to described I, Q correlation, calculates S time delay expansion sampled result of each time slot in P the time slot; P is a positive integer;
Time delay expansion accumulator module 23 is used for that expansion adds up to the time delay in the time slot of frame, draws the time delay spreading result of every frame, and described time delay spreading result is sent to and is stored in the time delay extension storage module 24;
Be illustrated in figure 3 as the time delay expansion of each frame P time slot, suppose that the sampled value of the 1st time delay expansion is respectively D11, D12, until D1S.The sampled value of the 2nd time delay expansion is respectively D21, D22, until D2S.To D11, D21, until DP1 adds up, the time delay expansion after adding up is left in the time delay extension storage module 24.In like manner to D12, D22, until DP2 adds up, the expansion of time delay after adding up is left in the time delay extension storage module 24.The time delay expansion of finishing S sampled point adds up and afterwards finishes to add up in a frame.
Time delay extension storage module 24 is used to store the middle time delay spreading result and the final time delay spreading result that add up from time delay expansion in the frame of time delay expansion accumulator module 23, and described time delay spreading result is sent to time delay extended filtering module 25;
Time delay extended filtering module 25 is used for the time delay spreading result of past N frame and the time delay spreading result of present frame are averaged filtering, and the time domain equation of described average filter is
Utilize above-mentioned formula to carry out N interframe time delay extended filtering respectively for S time delay spreading result, corresponding sampled point is carried out cumulative mean.
Time delay expansion interpolation filtering module 26, be used for when the described time delay expansion of described selector switch 27 controls interpolation filtering module 26 is connected with described interframe time delay memory module 28 with described time delay extended filtering module 25, handle carry out interpolation from the time delay spreading result of described time delay extended filtering module 25, and the time delay spreading result after the interpolation processing is sent to described interframe time delay extension storage module 28;
Whether selector switch 27 is used to control described time delay expansion interpolation filtering module 26 and is connected with described interframe time delay extension storage module 28 with described time delay extended filtering module 25;
If because time delay expansion interpolation filtering, time delay is expanded the sampling number after the sampled point number is less than frame filter in the present frame, then expansion is sampled to the interframe time delay, then time delay extended filtering between achieve frame.
Interframe time delay extension storage module 28, be used for when the described time delay expansion of described selector switch 27 controls interpolation filtering module 26 is connected with described interframe time delay memory module 28 with described time delay extended filtering module 25 the time delay spreading result that storage is handled from the process interframe of described time delay expansion interpolation filtering module 26; When the described time delay expansion of described selector switch 27 controls interpolation filtering module 26 was not connected with described interframe time delay memory module 28 with described time delay extended filtering module 25, storage was from the time delay spreading result of described time delay extended filtering module 25; And with the storage the time delay event memory be sent to described peak value searching module 29;
Peak value searching module 29, be used for being stored in the time delay spreading result of interframe time delay extension storage module 28, utilize peak value searching that the time delay spreading result is carried out the peak value searching ordering, draw M maximum in every frame sampled value, and preserving M peak value and position thereof, M is a positive integer.As shown in Figure 4, M peak value and position thereof are stored, P0 maximum wherein, P1 takes second place, by that analogy.
As shown in Figure 5, another concrete structure chart of implementing of device of the present invention, itself and the foregoing description difference are described time delay expansion interpolation filtering module 25 and described interframe time delay extension storage module 28 are carried out place-exchange.
As shown in Figure 6, the described method of the embodiment of the invention may further comprise the steps:
Step 61, it is relevant with scrambler and spreading code I, the Q data received to be slided, and obtains I, Q correlation that the sampled point number is S; S is the integer greater than 1;
Step 62 according to described I, Q correlation, calculates S time delay expansion sampled result of each time slot in P the time slot; P is a positive integer, and P time slot formed a frame;
Step 63 adds up to the time delay spreading result of the sampled point of the S in each frame at P time slot;
Step 64 is stored the interior time delay of frame of each frame and is expanded median and the end value that adds up;
Step 65 as shown in Figure 7, averages filtering to being used for to the time delay spreading result of past N frame and the time delay spreading result of present frame, and N is a positive integer; Can improve the precision of time delay expansion like this;
Step 66 is carried out the interpolation operation to filtered time delay spreading result; Can improve the sampling number of time delay expansion like this;
Step 67, the sampled point number of the time delay spreading result after the more described interpolation operation and the sampled point number of the time delay spreading result in the present frame, the sampled point number of the time delay spreading result after comparative result is the operation of described interpolation is during greater than the sampled point number of the time delay spreading result in the present frame, described time delay spreading result is sampled, and the time delay spreading result after the sampling is averaged filtering;
Step 68 to the time delay spreading result of every frame, utilizes peak value searching that the time delay spreading result is carried out the peak value searching ordering, draws M maximum in every frame sampled value, and preserves M peak value and position thereof, and M is a positive integer.
The present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (8)
1. peak value searching device that is used for code division multiple access, described device comprise time delay expansion accumulator module at least, time delay extension storage module, and interframe time delay extension storage module and peak value searching module is characterized in that, also comprise time delay extended filtering module;
Described time delay extension storage module is used to store the time delay spreading result from every frame of described time delay expansion accumulator module, and this time delay spreading result is sent to described time delay extended filtering module;
Described time delay extended filtering module, be used for carrying out filtering from the time delay spreading result of the past N frame of described time delay extension storage module and the time delay spreading result of present frame, and filtered time delay spreading result is sent to described interframe time delay extension storage module, N is a positive integer;
Described interframe time delay extension storage module is used to store the time delay spreading result of handling from the process interframe of described time delay extended filtering module, and this time delay spreading result is sent to described peak value searching module.
2. device as claimed in claim 1 is characterized in that, the described average filter that is filtered into.
3. device as claimed in claim 2 is characterized in that, the time domain equation of described average filter is:
4. device as claimed in claim 1, it is characterized in that, described device also comprises time delay expansion interpolation filtering module and selector switch, and whether described selector switch is used to control described time delay expansion interpolation filtering module and is connected with described interframe time delay extension storage module with described time delay extended filtering module; Described time delay expansion interpolation filtering module is used for when described selector switch is controlled described time delay and expanded the interpolation filtering module and be connected with described interframe time delay memory module with described time delay extended filtering module, handle carry out interpolation from the time delay spreading result of described time delay extended filtering module, and the time delay spreading result after the interpolation processing is sent to described interframe time delay extension storage module.
5. a peak value searching method that is used for code division multiple access is characterized in that, this method may further comprise the steps:
(1) with scrambler and spreading code the data of receiving are slided relevantly, obtain the correlation that the sampled point number is S, S is the integer greater than 1;
(2) according to described correlation, calculate S time delay expansion sampled result of each time slot in P the time slot, P is a positive integer, P time slot formed a frame;
(3) the time delay spreading result of the sampled point of the S in each frame at P time slot added up, store the time delay spreading result of every frame;
(4) the time delay spreading result of past N frame and the time delay spreading result of present frame are carried out filtering, N is a positive integer, the time delay spreading result that storage is handled through interframe;
(5) utilize peak value searching that the time delay spreading result of handling through interframe is carried out the peak value searching ordering, draw peak value.
6. method as claimed in claim 5 is characterized in that, the described average filter that is filtered into.
7. method as claimed in claim 6 is characterized in that, the time domain equation of described average filter is:
8. method as claimed in claim 5 is characterized in that, the step of described method (4) further comprises step:
Before the time delay spreading result that storage is handled through interframe, filtered time delay spreading result is carried out interpolation handle.
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| CN101068126B true CN101068126B (en) | 2011-06-22 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1312966A (en) * | 1998-08-17 | 2001-09-12 | 阿斯科姆电力线通讯有限公司 | System for transmitting message via low-voltage power supply network and adapted thereof |
| CN1529443A (en) * | 2003-09-28 | 2004-09-15 | 中兴通讯股份有限公司 | CDMA system multi-path peak value searching method |
| WO2005064833A1 (en) * | 2003-12-26 | 2005-07-14 | Zte Corporation | Multi-path search method of code-division multiple-access system |
| WO2005109663A1 (en) * | 2004-05-12 | 2005-11-17 | Ttpcom Limited | Multipath search method and apparatus |
| CN1759540A (en) * | 2003-03-11 | 2006-04-12 | Ttpcom有限公司 | Multi-path searching |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1312966A (en) * | 1998-08-17 | 2001-09-12 | 阿斯科姆电力线通讯有限公司 | System for transmitting message via low-voltage power supply network and adapted thereof |
| CN1759540A (en) * | 2003-03-11 | 2006-04-12 | Ttpcom有限公司 | Multi-path searching |
| CN1529443A (en) * | 2003-09-28 | 2004-09-15 | 中兴通讯股份有限公司 | CDMA system multi-path peak value searching method |
| WO2005064833A1 (en) * | 2003-12-26 | 2005-07-14 | Zte Corporation | Multi-path search method of code-division multiple-access system |
| WO2005109663A1 (en) * | 2004-05-12 | 2005-11-17 | Ttpcom Limited | Multipath search method and apparatus |
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Effective date of registration: 20151027 Address after: Dameisha Yantian District of Shenzhen City, Guangdong province 518085 Building No. 1 Patentee after: SANECHIPS TECHNOLOGY Co.,Ltd. Address before: 518057 Nanshan District high tech Industrial Park, Guangdong, South Road, science and technology, ZTE building, legal department Patentee before: ZTE Corp. |
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Application publication date: 20071107 Assignee: Xi'an Chris Semiconductor Technology Co.,Ltd. Assignor: SANECHIPS TECHNOLOGY Co.,Ltd. Contract record no.: 2019440020036 Denomination of invention: Peak value searching method and device used for code division multiple access Granted publication date: 20110622 License type: Common License Record date: 20190619 |
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